Burr removing attachment



May 15, 1951 w. R. WEAVER 2,552,755

BURR REMOVING ATTACHMENT Original Filed Nov. 14, 1944 Mil INVENTOR. wml-QED n. WEAVER Patented May 15, 1951 BURR REMOVING ATTACHMENT Winifred R. Weaver, Wichita, Kans., assignor to Beech Aircraft Corporation, Wichita, Kans., a

corporation of Delaware Continuation of application Serial No. 563,409,

November 14, 1944. This application September 2, 1949, Serial No. 113,810

( Cl. SII- 18) 3 Claims.

The invention relates to an attachment for cleaning the rough edges and removing burrs left around the edges of openings drilled or punched in sheet metal parts.

An object of the invention is to provide an attachment which will quickly remove any projecting burr and smooth the face of the material about such punched or drilled openings and which will accomplish this without possibility of injuring the article as by cutting into the face of the same.

Another object of the invention is to provide van'attachment in such form that the article can be held in both hands and thus be manipulated to best advantage while presenting it to the burring tool and to enable a more or less automatic positioning and centering of the work in respect to the tool.

A further object of the invention is to provide an attachment in a forni suitable for removing burrs in more or less inaccessible places, such as on the inside walls of sheet metal boxes and in restricted corner positions and the like.

A still further object of the invention is to provide an attachment in a, unit form adapted to be applied as an attachment to a drill press or other such suitable power operated machine.

Other desirable objects and the novel features by which the purposes of the invention are attained are set forth or will appear in the course of the following specification.

The drawing accompanying and forming part of the specification illustrates a present practical embodiment of the invention, but structure may be modified and changed all within the true intent and broad scope of the invention as hereinafter defined and broadly claimed.

.Figure 1 in the drawings is a front view of a commercial embodiment of the invention as applied to yand combined with an ordinary drill press;

Figure 2 is a plan view of the attachment with the post of the drill press appearing in section as on substantially the plane of line 2 2 of Figgure l;

Figure 3 is an enlarged vertical sectional'view of the tool unit as in use for removing the burr on the inside of a sheet metal box.

In Figures l and 2, where the invention is shown embodied in the form of an attachment applicable as such to an ordinary drill press, the base of such machine is indicated at 5, having a standard or upstanding post B, carrying the power head (not shown) driving the drill chuck 1.

The attachment comprises a drive shaft or spindle 8 which is rotatably mounted in a housing ll, the drive shaft having one endV projecting from the housing 9 for connection to the drill chuck l. The attachment includes a bracket I which has one end secured to the standard 6. The housing 9 is mounted in the other end of the bracket IIJ for rotative and slidable adjustment with respect thereto.

In the illustration, the bracket I0 is shown in the form of a bar adjustably secured at one end on the standard 6 by a clamp plate I I and screw connection I2. The other end of the bracket I0 is provided with means for mounting the housing 9 for rotative and slidable adjustment with respect thereto, such means embodying a U- shaped clamp plate I3 which is `arranged in coacting relation with respect to the other end of the bracket I0, the housing being embracingly received within the bight of` the clamp plate I3. The clamp plate I3 is fiXedly secured to the other end of the bracket It by means of screw connections I4 passing through the latter end o1' the bracket and the clamp plate. In this manner the attachment is rigidly supported in the desired rotative `and slidable adjustment.

For all general purposes and particularly for facing oi the inside surfaces of sheet metal boxes and the like the attachment may be constructed as shown in Figure 3, with -a right angled tubular extension I5 yat the lower end of the tubular housing 9, the extension carrying a bearing It for a driven shaft I1 connected with the drive shaft or spindle 8 by bevel gearing I8 and having a screw socket I9 or equivalent mounting means for a cutter.

The cutter is shown as consisting simply of a central stud 2D having a screw lstem 2| at the back which stem removably engages in the screw socket I9, the stud carrying cutting or planing blades 22 spaced inwardly from the free end thereof and projecting radially therefrom in angularly spaced relation to each other. These blades are indicated in Figure 3 as having straight, at faces 23 at the forward side of the same, all in the same common plane to serve as abutments which will ride at over the wall surface after thev rearwardly faced inclined cutting edges 24 have removed any projecting burr 25 that may be present around the burred side of an opening such as 2B in a sheet metal piece 3l. These projecting blades or teeth are thus designed to remove any burr raised about the opening and to smooth down the trimmed or cut surface hush with the surrounding surface or face of the sheet metal piece. This form o f cutter will thus cleanly remove any projecting burr without cutting into the normal face of the article, even though pressure be continued after th-e burr removing operation has been completed.

The central projecting stud 2i] of the cutter serves as a pilot for guiding the work into centered position over the cutter and has a handle means for attaching it to or removing it from the driving and supporting shaftin-g. In the illustration it is shown as having a screw driver slot 21 for this latter purpose, in the outer end of the same.

To aid in locating the piece 3'! at true right angles to the cutter and limit the cutting action of the cutter to only the removal of the burr, there is provided a means carried by the end of the housing 9 adjacent the other end of the driven shaft il which is engageable with the face of the piece 3.' on the burred side of the opening, said means embodying an annular gage 23 which is shown removably seated in a cavity 29 in a rin-g 39 screwed over the tubular extension I5 and secured in adjusted relation by lock nut 3i. This gage serve as a guard ring about vthe cutter and is shown as having a bevelled forward end disposed substantially hush with the forward faces of the cutter blades. The removability of the gage and positioning element enables quick substitution of gages of ditierent sizes and shapes to suit the work being performed.

In using the machine, the projecting stud 2i! of the Vcutter may ordinarily be utilised as a pilot for centering the work over the cutter, and this piloting of the piece into position also assists in feeding the piece straight toward the cutter and ilat up against the gage in said ring.

The gaging, guiding and cutting elements being rigidly supported, ,permits of the work being taken in both hands and simply forced up flat against the face of the device, without special care other than to make sure of engaging the opening in the piece over the piloting center of the cutter. The assistance thus aiorded in properly presenting the work enables high speed production, without requiring special skill or attention.

The angled form of -tool illustrated is particularly desirable for reaching inside box structures and into remote corner positions and the like, but for some purposes the tool may be of straight design, with the shaft or spindle which is engaged in the chuck directly carrying the cutting tool. Also, it is contemplated that if of angular design, the angled extension of the shaftingmay he at something other than a right angle. Also, while shown designed as an attachment for a drill press or other power operated machine, it is realized that the apparatus may be made up with its own power unit built into and forming an integral part of the same. Y

This application is a continuation for my prior application, Serial No. 563,409, iled November 14, 1944, Burr Removing Machine, now abandoned,

What is claimed is:

l. In a burr removing attachment, a bracket having one end adapted to be secured to a supporting standard, a housing mounted in the other end of said bracket .for rotative and slidable adjustment `with respect thereto, a drive shafty rotatably mounted in said housing and having one 'end projecting from the latter, for connection to a driving means, a driven shaft arranged transversely of said drive shaft and rotatably supported in said housing, one end of said driven shaft being operatively connected to the other end of said drive shaft, a pilot on the other end of said driven shaft adapted to be inserted in a burred opening in a piece of sheet metal from the burred side of said opening, a cutter spaced inwardly from the free end of said pilot and projecting radialy therefrom for removing the burr from the burred side of said opening, and means carried by the end of said housing adjacent the other end of said driven shaft and engageable with the face of the sheet metal piece on the burred side of said opening for limiting the cutting action of the cutter to only the removal of the burr.

2. In a burr removing attachment, a bracket having one end adapted to be secured to a supporting standard, a housing mounted in the other end of said bracket for rotative and slidable adjustment with respect thereto, a drive shaft rotatably mounted in said housing and having one end projecting from the latter, for connection to a driving means, a driven shaft arranged transversely of said drive shaft and rotatably supported in said housing, one end of said driven shaft being operatively connected to the other end of said drive shaft, a pilot on the other end of said driven shaft adapted to be inserted ina burred opening in a piece of sheet metal from the burred side of said opening, a plurality' of cutters spaced inwardly from the free end of vsaid pilot and projecting radially therefrom in angularly spaced relation to each other for removing the burr from the burred side of said opening, and means carried by the end of said housing adjacent the other end of said driven shaft and engageable with the face of the sheet metal piece on the burred side of said opening for limit ing the cutting action of the cutter to only the removal of the burr.

3. In a burr removing attachment, a bracket having one end adapted to be secured to a supporting standard, a housing mounted inthe other end of said bracket for rotative and slidable adjustment with respect thereto, a drive shaft rotatably mounted in said housing and having one end projecting from the latter, for connection to a driving means, a driven Ashaft arranged transversely o said drive shaft and rotatably supported in said housing, one end of said driven shaft being operatively connected to the other end of said drive shaft, a pilot on the other end of said driven shaft adapted to be inserted in a burred opening in a piece of sheet metal from the burred side of said opening, a plurality of cutters spaced inwardly from the free end of said pilot and projecting radially therefrom in angularly spaced relation to each other for removing the burr from the burred side of said opening, and means Vembodying an annular stop gage carried by the end of said housing adjacent the other end of said driven shaft and engageable with the face of the sheet metal piece on thel burred side of said opening for limiting the cutting action of the cutter to only the removal of the burr.

WINIFRED R. WEAVER.

REFERENCES CITED The following references are of record inthe le ofthis patent:

UNITED STATES PATENTS Number Name "Date 1,055,013 Bennington et al. Mar. 4, 1913 1,628,975 Hawkins May 17, 1927 2,398,447 Greenbaum Jan. l2, 1943 2,356,359 Seiter Aug. 22J 1944 2,363,444 Shipman Nov. 2l, 1944 FOREIGN PATENTS Number Country Date 551,570 Great Britain Mar.l l, 1943 

